Here’s the Reddit thread where this started. The short version is: /u/Takfloyd pointed out that, when you first enter a Divine Beast (and up until you activate one of its terminals), for example Vah Medoh, the music includes Morse code, beeping an SOS.
Then /u/TonesBalones and /u/Dragonaichu point out that, while there’s definitely an SOS in the left channel, the right channel plays different Morse: . . – . – – . .
So what does that mean?

